Answer:
Retrospective cohort study
Explanation:
A cohort study is the study where people are grouped according to the factors they have been exposed to. The cohort is the group.
A retrospective cohort study is the study where the cohort who has been exposed to certain factors is compared with another cohort who has not been exposed to the factors that the first cohort has been exposed. This study is a long term study.
Here, the people's health of those that have been exposed to benzene will be compared to the the people who have been working there after 1970.
Hence, here a retrospective cohort study will be done.
Germany and their biggest export to the U.S. is passenger vehicles, followed by machinery and pharmaceuticals.
Answer:
The correct statment would be: "the hormons of the endocrine system exert their action by lock and key mechanism."
Explanation:
The endoncrine system is responsable of the release of hormons under certain conditions, and in different organs, they go trough the bloodstream. The lock and key mechanism is explained as how the receptors block or release hormonos or instead they don´t. The endocrine system is responsable for the reproductive system, and regulates metabolic processes.
Bystander effect or the bystander apathy as it is also known
is a psychological phenomenon which states that people are less likely to help
a person in need if a group of people is also present nearby. In the tragedy of Kitty Genovese not one
of the 38 neighbors called the police. This shocking death is one of the most
horrible examples of the bystander effect.